CHELSEA, Manhattan -- Disturbing details are emerging in the case of a well-known Manhattan dentist who was arrested on child pornography charges Friday morning; and authorities fear there may be more victims.

John Wolf, 59, was taken into custody at his Greenwich Village home on Charles Street. At the same time, FBI agents raided his Chelsea office on West 15th Street. They pulled computers from the office and looked at a surveillance camera that was up on the wall.

Wolf was charged with possession of child pornography, and investigators fear that underage patients may have been videotaped at his office. They said Wolf used his office as a place to view and distribute the child pornography.

"In recorded conversations with an FBI undercover agent, the defendant admitted that he possessed child pornography and provided the undercover agent with a flash drive containing files depicting child pornography, including videos of children as young as toddlers being raped by adult men," federal prosecutors said in a news release.

Authorities said a known drug dealer supplied dentist John Wolf large quantities of methamphetamine in exchange for free dental services. The drug dealer, who is a government informant, witnessed Wolf doing meth with his employees at the Chelsea office, according to court documents. Wolf also showed him images of child porn on his cellphone. Prosecutors said Wolf would also distribute the meth to others.

The court documents revealed that Wolf told the informant he is HIV positive and has unprotected sex, even "puncturing holes in condoms in an intentional attempt to spread the HIV virus to his sexual partners."

Wolf said he was "actively involved in underground sex parties at various locations in New York City, including Brooklyn, where participants would engage in sexual intercourse with animals."

Wolf was recorded by federal investigators talking about having sex with animals and showing cellphone pictures depicting bestiality. He discussed drugging one man with "Special K," or ketamine, to sexually assault him. Ketamine is a medication used mainly for starting and maintaining anesthesia and is also illegally used as a recreational hallucinogenic, according to investigators.

Wolf told an undercover FBI agent that he had used the basement of his Chelsea office for sex parties and was interested in "more perverted child pornography sites," describing one video he liked of an "8-year old 'retarded' girl engaged in sex."

Wolf is scheduled to appear before a magistrate in federal court in Brooklyn Friday afternoon.

The FBI is asking anyone with information about this case, or if you believe you or a family member may have been a victim, please contact them at (212) 384-5000.